Sound-box



H. K. SANDELL.

SOUND BOX.

APPLICATION FILED JUNE 19. 1926.

Patented Dec. 6, 1921.,

UNITED STATES Parsnr T HERBERT S. MILLS, OF

SOUND-BOX.

Application filed June 19,

To all whom it may concern.

Be it known that I, HENRY K. SANDELL, a citizen of the United States, residing at 221 So. Green street, Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Sound- Boxes, of which the following is a specification.

The present invention relates to improvements in sound reproducing devices, and more particularly to sound boxes in which a diaphragm is supported, which is caused to vibrate and thereby emit sound waves, and will be fully understood from the following description of an embodiment thereof, illustrated by the accompanying drawings, in which:

Fi ure 1 is plan view of a portion of a tone arm, showing the sound box in position thereon;

Fig. 2 is a side elevation of a a tone arm, with the sound box attached thereto in position for playing records with lateral sound wave impressions;

Fig. 3 is a front elevation of the sound box, and

Fig. 4 is a section through the sound box on the lines 4 of Figs. 1 and 2.

Referring more particularly to the drawings, the numeral 5 indicates the circular casing of the sound box and 6 the back, to which is secured the sound conduit 7, which may be, as illustrated, a part of the tone arm. A suitable diaphragm 8, which may be of mica, for example, is retained in position in the sound box by suitable gaskets 9 and by the attachment of the back 6 to the circular casing 5 of the sound box.

A stylus support is mounted upon the sound box, for example, in the following manner. At one side of the sound box two studs 10, 10 project, and upon them is mounted or attached, for example, by screws, the head of a T-shaped metallic member 11, to the projecting stem of which is secured the stylus holder 12. The stem of the member 11 is formed of thin gage metal, and is flex ible and resilient, and consequently the stylus holder 12 may vibrate freely with substantially a pivotal movement about an axis near the point at which the stem of the member 11 joins its head. The vibratory movement of the stylus holder12 is substantially in a plane parallel to the plane of the diaphragm 8, and the stylus holder itself is portion of Specification of Letters Patent.

l atented Eco. 6, 1921.

1929. Serial No. 330,209.

positionec. at substantially a right angle to said plane. The stylus holder 12 is provided with two openings, one 13, in the longitudinal direction of the holder the other, 14, at an angle thereto, and a stylus may be retained in either of'these openings by means of the said screw 15. The vibrations of the stylus holder are transmitted to the diaphragm by means of a suitable metallic link 16, preferably a wire, which is substantially rigid, and which joins the dia phragm at an acute angle less than and preferably of 22 to 25.

The sound box, in playing lateral wave records, is used in the position shown in Fig. 2 and in full lines in Fig. 1. The stylus is placed in the opening 13 extending longitudinally of the stylus holder and the lateral vibrations of the latter are transmitted through the diaphragm longitudinally through the link 16. In playing the socalledhill-and-dale records the sound box is placed in the positi 11 shown in dotted lines in Fig, 1, the stylus being secured in the opening 14 in the stylus holder.- The diaphragm is then in substantially vertical position.

Although the present invention has been described in connection with the specific details of an embodiment thereof, it is not intended that these details shall be regarded as limitations upon the scope of the invention, except in so far as included in the accompanying claims.

claim:

1. A sound box comprising a diaphragm, a supportin casing therefor, a stylus support pivotally mounted upon said casing at an angle to the plane of the diaphragm and vibratory in a direction substantially parallel to the plane of said diaphragm, and a vibration from a point on said support intermediate its pivot point and its free end to a centrally located point on said diaphragm and making an acute angle with the latter whereby movement of the stylus holder is transmitted to the diaphragm longitudinally of the vibration transmitting member and is compounded there.

2. A sound box comprising a diaphragm, a supporting casing therefor, a stylus holder pivotally mounted upon said casing at substantially right angles thereto and vibratory in a direction substantially parallel to transmitting member extending the plane of the diaphragm and a link extending from a point on said support inter mediate its pivot point and its free end to a centrally located point on said diaphragm and making an angle of about 22 to 25 therewith. v

3. A sound box comprising a diaphragm, a supporting casing therefor, a flexible member secured to said casing and extending at substantially a right angle to the plane of the diaphragm, a stylus holder secured to the flexible member, and a link extending from a point on said support intermediate its pivot point and its free end to a centrally located point on said diaphragm and making an angle of about 22 to 25 therewith.

l. A sound box comprising a diaphragm, a supporting casing therefor, a stylus sup port pivotally mounted upon said casing, and a longitudinal vibration transmitting ,member connecting a point on the stylus support removed from its pivotal center with the diaphragm and making an acute angle with the latter whereby vibrations of the stylus support are transmitted longitudinally of the said transmitting member to the diaphragm.

HENRY K. SANDELL. 

